Over the years I have gotten many questions on Terramites:
Here are a few FAQ:
Hydraulics: they Don't take hydraulic fluid, just regular motor oil same as motor, usually 15w-40 unless in severe cold conditions. Putting hydraulic fluid in the system will cost you a pump.
Transmission Whine: they all do it, especially the T5C's , nothing to worry about, it's just how they are.
It will barely go up hill with a full scoop, it must be worn out?
No, it has to do with how you are using the "go peddle".
Same thing applies when picking up dirt. At a given RPM you can have SPEED or POWER , not both.
So try the same load, same RPM, just push go peddle slightly down, much less speed,but much more power.
This is noticeable in the T5C more than the T7 and T9's.
These machines are really tough but they can't grease themselves. Most of the problems I see are maintenance or rather lack of maintenance related.
Lots of things I don't know about them but I do know that oil,filters, grease fittings and grease are much cheaper than pins,bushings and engines.
PS. If you must do battle with a Black Walnut stump, go easy, the T9 is powerful enough to break its own backhoe bucket.
My first T9 taught me that one. Did get the stump though"